infinite baffle towards a back room ?

[RaymondFromThePyrénéés]

in the smaller room, yes, if indeed I take away the ceiling,
the roof, once isolated, would indeed become irregular.
I can also take away the back room, or simply make
the door opening 4 times larger to get even more
irregularity either behind the speakers or behind
the listener. here is the attick, slanted roof and so on